Can't get the tech press/bloggers to focus on the core issue in AddressBookGate, so let's do it ourselves.

Which of the apps on my iPhone is transmitting everything I think is private and to whom are they transmitting it?

I'm not an iOS developer so I can't answer this question myself.

But lots of iOS developers read this site, so could you help quantify the extent of the problem?

Paul Robichaux just posted this. "The iOS address book is one of the few data stores that apps can easily access, along with the music library and the camera roll. Other data types, like the store of SMS messages, aren't accessible. The full list is available in the iOS developer documentation. "

Very helpful. So it's reasonable to assume that our music and photos are out there, in addition to our contact info.